driven C–H ketoalkylation of glycine derivatives and peptides with cycloalkyl hydroperoxides is presented. This protocol provides a straightforward route to unnatural amino acids bearing a distal carbonyl group with moderate to good yields. Preliminary mechanistic studies revealed that both a SET event and radical chain propagation were involved in this transformation.
A cheap iron-catalyzed C–C bond cleavage/thiolation and selenylation of cycloalkyl hydroperoxides are presented. This redox-neutral protocol provides efficient access to diverse distal keto-functionalized thioethers and selenium compounds. Remarkably, only some amounts of disulfides are required for this transformation.
Catalytic Asymmetric Peroxidation of α,β-Unsaturated Nitroalkenes by a Bifunctional Organic Catalyst
作者:Xiaojie Lu、Li Deng
DOI:10.1021/ol500677v
日期:2014.5.2
A new enantioselective peroxidation of α,β-unsaturated nitroalkenes was realized with an easily accessible acid–base bifunctional organic catalyst derived from cinchona alkaloids. This reaction provides unprecedented easy access to optically active chiral peroxides, as illustrated by the asymmetric synthesis of β-peroxy nitro compounds.
α-trifluoromethylalkenes via a C–C bond cleavage/radical addition/azidation cascade is described. This protocol features a broad substrate scope, excellent functional group compatibility, and the ability to be performed on a gram scale, thus offering a practical and step-economic approach to the synthetically useful tertiary α-trifluoromethyl azides.
描述了通过 C-C 键断裂/自由基加成/叠氮化级联进行的 α-三氟甲基烯烃的简洁 Fe 催化烷基叠氮化反应。该协议具有广泛的基板范围、出色的功能组兼容性以及在克规模上执行的能力,从而为合成有用的叔α-三氟甲基叠氮化物提供了一种实用且经济的方法。
Iron-Catalyzed Alkoxyl Radical-Induced C–C Bond Cleavage/<i>gem</i>-Difluoroalkylation Cascade
An inexpensive iron-catalyzed alkoxyl radical-induced C–C bond cleavage/gem-difluoroalkylation cascade is presented. Regulated by the structure of alkoxyl radical precursors, fluorinated distal diketones were synthesized through a ring-opening strategy and difluoroalkylated medium-sized lactones and macrolactones were constructed via a ring-expansion strategy. Both protocols proceeded under mild and